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If it is necessary to replace fuses frequently, an electrical problem may exist. Contact your Cat dealer. |
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Always replace fuses with the same type and capacity fuse that was removed. Otherwise, electrical damage could result. |
The electrical panel for the fuses, the circuit breakers, and the relays is positioned behind the seat on the right rear of the operator station.
Fuses protect the electrical system from damage that is caused by overloaded electrical circuits. Replace a fuse if the element separates. If the fuse of a particular electrical system requires frequent replacement, check the electrical circuit. Repair the electrical circuit, if necessary. Use the tool that is stored on the electrical panel to remove the fuses.
Push in the button to reset the circuit breaker. If the electrical system is working properly, the button will remain depressed. If the button does not remain depressed, check the appropriate electrical circuit. Repair the electrical circuit, if necessary. Use the tool that is stored on the electrical panel to remove the circuit breakers.
24 Volt Fuses/Circuit Breakers
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| Illustration 1 | g03007877 |
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Upper 24V fuse block is unswitched (constant power from battery). Lower 24V fuse block is switched (powered through the key switch). (1) Detect Object Detection (15Amp) (2) Key Switch (10 Amp) (3) Engine ECM (20 Amp) (4) Brake ECM (20 Amp) (5) Product Link (15 Amp) (6) VIMS (7) Inverter Cabinet (AC Drive Only) (15 Amp) (8) Inverter Cabinet (AC Drive Only) (15 Amp) (9) Inverter Cabinet (AC Drive Only) (15 Amp) (10) Inverter Cabinet (AC Drive Only) (15 Amp) (11) Front Work Lights (10 Amp) (12) Rear Work Lights (10 Amp) (13) Fuel System (20 Amp) (14) Flashers, Dome/Map Lights, Service Connector, Stop Lamp, Running Lamp, Door Light Switch (15) Monitoring System (Gauges/Advisor), Mirror Heat, Retarder Lever (16) Power Train ECM (20 Amp) (17) 24 V to 12 V Converter (20 Amp) (18) Chassis ECM (20 Amp) (19) Horn (15 Amp) (20) Stairway Access Lights (20 Amp) (21) HVAC Water Valve (20 Amp) (22) Horn - Additional (AC Drive Only) (20 Amp) (23) Wiper (20 Amp) (24) Air Dryer (20 Amp) (25) Air Starter (20 Amp) (26) HVAC Control (20 Amp) (27) Air Seat (20 Amp) (28) Engine Service Lighting (15 Amp) (29) Heated Mirror Timer (20 Amp) (30) Power Window - LH (20 Amp) (31) Companion Seat (20 Amp) (32) Power Window - RH (20 Amp) (33) Seat Belt (10 Amp) (34) Cab Air Cleaner (20 Amp) (35) Heated Mirror (20 Amp) (36) Engine Pre-lube (20 Amp) (37) Chassis Power (10 Amp) (38) Fog Lights (20 Amp) (39) Electronic Engine Thermostat (15 Amp) (40) Back up Alarm/Backup Lights (20 Amp) (41) Alternator Excitation Field Regulator (AC Drive Only) (15 Amp) | |
The 12V fuse block is located behind the trim panel at the right rear of the operator station.
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| Illustration 2 | g03009517 |
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F1 through F10 are unswitched (constant power from battery). F11 through F20 are switched (powered through the key switch). (42) Minestar (15 Amp) (43) Entertainment Radio (20 Amp) (44) Detect Radars (10 Amp) (45) Power Port - Dash (15 Amp) (46) Power Port - Rear (15 Amp) (47) Communications Radio (Overhead Panel) (20 Amp) (48) Cigar Lighter (15 Amp) (49) Communications Radio (Rear Panel) (15 Amp) (50) Entertainment Radio (15 Amp) | |
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| Illustration 3 | g03010218 |
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(51) High-Speed Blower (20 Amp)
(52) Brake Retraction Motor (20 Amp) (53) Headlights (15 Amp) (Automatic reset circuit breaker) | |
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| Illustration 4 | g06173041 |
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(54) Powered Stairway Switch (10 Amp)
(55) Powered Stairway Main Power (150 Amp) | |
The circuit breakers for the powered stairway are on the back of the platform for the powered stairway (right side access shown).
A relay is an electrical switch that opens and closes under the control of another electrical circuit. Use the tool that is stored on the electrical panel to remove the relays.
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| Illustration 5 | g03010399 |
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(56) Engine Pre-lube
(57) Engine Lockout (Indicator) Lamp (58) Backup Alarm (59) Cab Air Cleaner (60) AC Clutch (61) Fuel Priming Pump (62) Wiper (63) Wiper - High (64) Seat Belt (65) VIMS Red Lamp (Payload) (66) Wiper - Slow/Intermintent (67) VIMS Blue Lamp (Service Light) (68) VIMS Green Lamp (Payload) (69) Detect - Rear (70) Detect - Side (71) Drive Train Lamp (A misc. relay that powers multiple circuits) (72) Stop Lights (73) Headlight (74) Autolube (75) Idle Shutdown Timer (76) Backup Lights (77) Engine Starters (78) Window Washer | |
Note: There are more relays for the windows, horn, and heated mirrors located behind the trim panel at the right rear of the operator station.
LAJ1-620 and ; WSP1-129
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| Illustration 6 | g06171845 |
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(A) Main Breaker (Cutout View)
(B) Alternator Breaker (Cutout View) (79) Main Breaker (150 Amp) (Front View) (80) Alternator Breaker (150 Amp) (Front View) | |
Main circuit breakers are on the inner left-hand frame rail in the engine compartment. Refer to Illustration 6.
LAJ621-Up and ; WSP130-Up
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| Illustration 7 | g06173025 |
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(C) Alternator Breakers (Cutout View)
(D) Cab Breaker (Cutout View) (E) Pre-lube and Machine Auxiliary Breakers (Cutout View) (81) Alternator Breakers (90 Amp) (Front View) (82) Cab Breaker (2) (150 Amp) (Front View) (83) Pre-lube and Machine Auxiliary Breakers (3) (150 Amp) (Front View) | |
The pre-lube and user-defined accessory circuit breakers are on the inner left-hand frame rail in the engine compartment. There are two circuit breakers wired in parallel (Max. 300 Amps) which provide protection to the pre-lube and user-defined accessory circuits. Refer to Illustration 7.
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| Illustration 8 | g06173026 |
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(84) 3-Post 24V Battery Junction Block
(85) Machine Ground Access Boss | |
The user-defined accessory circuit access location is on the inner left-hand frame rail in the engine compartment. There is a 3-post 24V battery junction block and machine ground access boss located in close proximity. These components provide a circuit-protected manner to connect to the machines 24V unswitched power circuit. Refer to Illustration 8.
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| Illustration 9 | g06202953 |
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(86) Fuse and Relay Block
(87) Fuse Block (88) Circuit Breaker | |
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Main Power (88) |
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| Illustration 10 | g06202959 |
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Ethernet Switch 1 (89) - 10A |
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Ethernet Radio (90) - 10A |
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Ethernet Router (91) - 10A |
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Light Detection and Ranging (Lidar) Sensor (92) - 15A |
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Ethernet Switch 2 (93) - 10A |
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Ethernet Switch 3 (94) - 10A |
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Cabinet Fan (95) - 30A |
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Global Positioning System (GPS) (96) - 15A |
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Horn and head lamp (97) - 10A |
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Key Start Switch (98) - 10A |
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Ethernet Switch 4 (99) - 10A |
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12 Volt Primary Convertor (100) - 10A |
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12 Volt Secondary Convertor (101) - 10A |
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Autonomous Electronic Control Module (ECM) 5 (102) - 10A |
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Autonomous ECM 2 (103) - 15A |
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Autonomous ECM 1 (104) - 15A |
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Autonomous ECM 4 (105) - 15A |
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Autonomous ECM 3 (106) - 15A |
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Machine - ECM Master 1 (107) - 10A |
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Machine - ECM Slave 2 (108) - 15A |
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Backup Battery 1 (109) - 15A |
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Backup Battery 2 (110) - 15A |
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Secondary Steering ECM (111) - 15A |
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Service Brake Pressure Sensor (112) - 10A |
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Router (113) - 10A |
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Turn Signal - Right (114) |
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Turn Signal - Left (115) |
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Horn (116) |
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Headlamp (117) |
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Key Start Switch (118) |
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| Illustration 11 | g06202962 |
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Left and Middle Radars 1 (119) - 10A |
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Right Radars 2 (120) - 10A |
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Rear Radars 3 (121) - 10A |
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Radars Key Switch (122) - 102 |
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ABS Internal Measuring Unit and Tire Monitoring System (TMS) (123) - 10A |
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USB Drive (124) - 10A |
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Pulse Per Second Buffer (125) - 10A |
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Left-hand Autonomous Stop Receiver 1 (126) - 10A |
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Right-hand Autonomous Stop Receiver 2 (127) - 10A |